FFN270 hydrochloride, a fluorescent tracer of norepinephrine, is a fluorescent substrate of the norepinephrine and vesicular monoamine transporters. FFN270 hydrochloride exhibits two resolved absorption/excitation maxima depending on solvent pH (FFN270 ex: 320 nm or 365 nm, em: 475 nm) and can function as ratiometric fluorescent pH-sensors. In Vitro FFN270 enables both an examination of noradrenergic microanatomy and an observation of synaptic activity in the cortex of intact neuronal circuits in vivo. MCE has not independently confirmed the accuracy of these methods. They are for reference only. Form:Solid